I've never had earwig damage in beans before, but I've grown dahlias a few times, and the old-fashioned, newspaper-stuffed, upturned flowerpots on sticks always trapped plenty of earwigs every night.

I've also heard of fish oil traps, for example the following (from the University of California):

"Traps can easily be hidden near shrubbery and ground cover plantings, or against fences. A low-sided can, such as a cat food or tuna fish can, with 1/2-inch of oil in the bottom makes an excellent trap. Fish oil (e.g., tuna fish oil) is very attractive to earwigs or vegetable oil with a drop of bacon grease can be used. Dump captured earwigs and refill cans with oil. Other common types of traps are a rolled-up newspaper, corrugated cardboard, bamboo tube, or short piece of hose. Place these traps on the soil near plants just before dark and shake accumulated earwigs out into a pail of soapy water in the morning. Continue these procedures every day until you are no longer catching earwigs."

Then when you've got rid of the earwigs, you'll need a spud gun to get rid of all the neighbourhood cats hanging around the garden looking for the tuna...

Earwigs are not the primary attackers of beans, they usually follow on where slugs have already damaged crops. Control slugs and the earwigs will go elsewhere. I agree with Peter English that dahlias are a great favourite for earwigs especially in moist weather. I shake them out when I see them.
michael brenock horticultural adviser (retired)

Earwigs are not the primary attackers of beans, they usually follow on where slugs have already damaged crops. Control slugs and the earwigs will go elsewhere. I agree with Peter English that dahlias are a great favourite for earwigs especially in moist weather. I shake them out when I see them.
michael brenock horticultural adviser (retired)

Just to add to Peter's excellent post on trapping, earwigs are also attracted to oatmeal whilst cats are not !! The tachinid fly is also a natural predator of the earwig and can be attracted by letting some herbs flower e.g. dill, parsley or sweet clover._________________http://thefoxygardener.blogspot.com

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